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<meta name="description" content="Users can zoom into and out of a diagram by drawing a rectangle showing what part of the document should be shown by the new viewport."/> 
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<title>Drag Zooming Tool</title>
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          <h1 class="mb-0 p-1 ">GoJS</h1>
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    <!-- Start of GoJS sample code -->
    
    <script src="../release/go.js"></script>
    <div class="p-4 w-full">
<script src="DragZoomingTool.js"></script>

<script id="code">
  function init() {
    if (window.goSamples) goSamples();  // init for these samples -- you don't need to call this
    var $ = go.GraphObject.make;  // for conciseness in defining templates

    myDiagram =
      $(go.Diagram, "myDiagramDiv",
        {
          initialDocumentSpot: go.Spot.Center,
          initialViewportSpot: go.Spot.Center,

          // Define the template for Nodes, just some text inside a colored rectangle
          nodeTemplate:
            $(go.Node, "Spot",
              { width: 70, height: 20 },
              $(go.Shape, "Rectangle",
                new go.Binding("fill", "c")),
              $(go.TextBlock,
                { margin: 2 },
                new go.Binding("text", "c"))),

          // Define the template for Links, just a simple line
          linkTemplate:
            $(go.Link,
              $(go.Shape, { stroke: "black" })),

          layout:
            $(go.TreeLayout,
              {
                angle: 90,
                nodeSpacing: 4,
                compaction: go.TreeLayout.CompactionNone
              }),

          model:
            $(go.TreeModel,
              { // we use single character property names, to save space if rendered as JSON
                nodeKeyProperty: "k",
                nodeParentKeyProperty: "p"
              })
        });

    // Add an instance of the custom tool defined in DragZoomingTool.js.
    // This needs to be inserted before the standard DragSelectingTool,
    // which is normally the third Tool in the ToolManager.mouseMoveTools list.
    myDiagram.toolManager.mouseMoveTools.insertAt(2, new DragZoomingTool());

    // This is a status message
    myLoading =
      $(go.Part,
        { selectable: false, location: new go.Point(0, 0) },
        $(go.TextBlock, "loading...",
          { stroke: "red", font: "20pt sans-serif" }));

    // temporarily add the status indicator
    myDiagram.add(myLoading);

    // allow the myLoading indicator to be shown now,
    // but allow objects added in loadTree to also be considered part of the initial Diagram
    myDiagram.delayInitialization(loadTree);
  }

  function loadTree() {
    // create some tree data
    var total = 99;
    var treedata = [];
    for (var i = 0; i < total; i++) {
      // these property names are also specified when creating the TreeModel
      var d = {
        k: i,  // this node data's key
        c: go.Brush.randomColor(),  // the node's color
        p: (i > 0 ? Math.floor(Math.random() * i / 2) : undefined)  // the random parent's key
      };
      treedata.push(d);
    }

    // give the Diagram's model all the data
    myDiagram.model.nodeDataArray = treedata;

    // remove the status indicator
    myDiagram.remove(myLoading);
  }
  window.addEventListener('DOMContentLoaded', init);
</script>
<div id="sample">
  <div id="myDiagramDiv" style="background-color: white; border: solid 1px black; width: 100%;height: 800px"></div>
  <p>
  This sample demonstrates the DragZoomingTool, which replaces the standard DragSelectingTool. It is defined in its own file, as <a href="DragZoomingTool.js">DragZoomingTool.js</a>.
  </p>
  <p>
  Press in the background, wait briefly, and then drag to zoom in to show the area of the drawn rectangle.
  Hold down the Shift key to zoom out.
  The rectangle always has the same aspect ratio as the viewport of the diagram.
  </p>
</div>
    </div>
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    <!--  End of GoJS sample code  -->
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